The simplest way to delete rows and columns from arrays is the numpy.delete method. Suppose I have the following array x: x = array([[1,2,3], [4,5,6], [7,8,9]]) To delete the first row, do this: x = numpy.delete(x, (0), axis=0) To delete the third column, do this: x = numpy.delete(x,(2), axis=1) So you could find the indices … Read more
You can try like this: //—deletes a particular title— public boolean deleteTitle(String name) { return db.delete(DATABASE_TABLE, KEY_NAME + “=” + name, null) > 0; } or public boolean deleteTitle(String name) { return db.delete(DATABASE_TABLE, KEY_NAME + “=?”, new String[]{name}) > 0; }
SQLMenace’s solution worked for me with a slight tweak to how data is deleted – DELETE FROM instead of TRUNCATE. — disable referential integrity EXEC sp_MSForEachTable ‘ALTER TABLE ? NOCHECK CONSTRAINT ALL’ GO EXEC sp_MSForEachTable ‘DELETE FROM ?’ GO — enable referential integrity again EXEC sp_MSForEachTable ‘ALTER TABLE ? WITH CHECK CHECK CONSTRAINT ALL’ GO
Add a limit to the delete query delete from orders where id_users = 1 and id_product = 2 limit 1
MySQL doesn’t reduce the size of ibdata1. Ever. Even if you use optimize table to free the space used from deleted records, it will reuse it later. An alternative is to configure the server to use innodb_file_per_table, but this will require a backup, drop database and restore. The positive side is that the .ibd file … Read more
Use the rowid pseudocolumn. DELETE FROM your_table WHERE rowid not in (SELECT MIN(rowid) FROM your_table GROUP BY column1, column2, column3); Where column1, column2, and column3 make up the identifying key for each record. You might list all your columns.
You simply need to specify on which tables to apply the DELETE. Delete only the deadline rows: DELETE `deadline` FROM `deadline` LEFT JOIN `job` …. Delete the deadline and job rows: DELETE `deadline`, `job` FROM `deadline` LEFT JOIN `job` …. Delete only the job rows: DELETE `job` FROM `deadline` LEFT JOIN `job` ….
Basically destroy runs any callbacks on the model while delete doesn’t. From the Rails API: ActiveRecord::Persistence.delete Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can’t be persisted). Returns the frozen instance. The row is simply removed with an SQL DELETE statement on the … Read more
Issue the following command to reseed mytable to start at 1: DBCC CHECKIDENT (mytable, RESEED, 0) Read about it in the Books on Line (BOL, SQL help). Also be careful that you don’t have records higher than the seed you are setting.